Delta Electronics VFD-M - Manual (Page 98)

Chapter 4 Parameters|
Revision May 2008, ME14, SW V3.04 4-63
Command code: 03H, read N words. The maximum value of N is 12. For example, reading
continuous 2 words from starting address 2102H of AMD with address 01H.
ASCII mode:
Command message: Response message:
STX ‘:’ STX ‘:’
‘0’ ‘0’ ADR 1
ADR 0
‘1’
ADR 1
ADR 0
‘1’
‘0’ ‘0’ CMD 1
CMD 0
‘3’
CMD 1
CMD 0
‘3’
‘2’ ‘0’
‘1’
Number of data
(count by byte) ‘4’
‘0’ ‘1’
Starting data address
‘2’ ‘7’
‘0’ ‘7’
‘0’
Content of starting
data address
2102H
‘0’
‘0’ ‘0’
Number of data
(count by word)
‘2’ ‘0’
‘D’ ‘0’ LRC CHK 1
LRC CHK 0
‘7’
Content of data address
2103H
‘0’
CR ‘7’ END 1
END 0
LF
LRC CHK 1
LRC CHK 0
‘1’
CR END 1
END 0
LF
RTU mode:
Command message: Response message:
ADR 01H ADR 01H
CMD 03H CMD 03H
21H Starting data address
02H
Number of data
(count by byte)
04H
00H 17H Number of data
(count by word)
02H
Content of data address
2102H
70H
CRC CHK Low 6FH 00H
CRC CHK High F7H
Content of data address
2103H
00H
CRC CHK Low FEH
CRC CHK High 5CH